Magic Cube

///////////////////////////////////////////////////////////////////////////////////////////////////

// Copyright 2019 Leszek Koltunski                                                               //

//                                                                                               //

// This file is part of Distorted.                                                               //

//                                                                                               //

// Distorted is free software: you can redistribute it and/or modify                             //

// it under the terms of the GNU General Public License as published by                          //

// the Free Software Foundation, either version 2 of the License, or                             //

// (at your option) any later version.                                                           //

//                                                                                               //

// Distorted is distributed in the hope that it will be useful,                                  //

// but WITHOUT ANY WARRANTY; without even the implied warranty of                                //

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                                 //

// GNU General Public License for more details.                                                  //

//                                                                                               //

// You should have received a copy of the GNU General Public License                             //

// along with Distorted.  If not, see <http://www.gnu.org/licenses/>.                            //

///////////////////////////////////////////////////////////////////////////////////////////////////

package org.distorted.magic;

import android.opengl.GLSurfaceView;

import org.distorted.effect.SizeChangeEffect;

import org.distorted.effect.UnscrambleEffect;

import org.distorted.effect.ScrambleEffect;

import org.distorted.library.effect.VertexEffectSink;

import org.distorted.library.main.DistortedEffects;

import org.distorted.library.main.DistortedLibrary;

import org.distorted.library.main.DistortedScreen;

import org.distorted.library.main.DistortedTexture;

import org.distorted.library.mesh.MeshFlat;

import org.distorted.library.message.EffectListener;

import org.distorted.library.type.Static4D;

import javax.microedition.khronos.egl.EGLConfig;

import javax.microedition.khronos.opengles.GL10;

///////////////////////////////////////////////////////////////////////////////////////////////////

public class RubikRenderer implements GLSurfaceView.Renderer, EffectListener

{

    private static final float CUBE_SCREEN_RATIO = 0.5f;

    private static final float CAMERA_DISTANCE   = 0.6f;  // 0.6 of the length of max(scrHeight,scrWidth)

    public  static final int TEXTURE_SIZE = 600;

    private RubikSurfaceView mView;

    private DistortedScreen mScreen;

    private Static4D mQuatCurrent, mQuatAccumulated;

    private Static4D mTempCurrent, mTempAccumulated;

    private float mCubeSizeInScreenSpace;

    private int mNextCubeSize, mScrambleCubeNum;

    private long mRotationFinishedID, mSizeChangeEffectID, mUnscrambleEffectID, mScrambleEffectID;

    private boolean mFinishRotation, mRemoveRotation, mFinishDragCurrent, mFinishDragAccumulated, mSolveCube, mScrambleCube;

    private boolean mCanRotate, mCanDrag;

    private RubikCube mOldCube, mNewCube;

    private int mScreenWidth, mScreenHeight;

    private MeshFlat mMesh;

    private SizeChangeEffect.Type mSizeChangeType;

    private UnscrambleEffect.Type mUnscrambleType;

    private ScrambleEffect.Type mScrambleType;

    private int mSizeChangeDuration, mUnscrambleDuration, mScrambleDuration;

///////////////////////////////////////////////////////////////////////////////////////////////////

    RubikRenderer(RubikSurfaceView v)

      {

      mView = v;

      mScreen = new DistortedScreen();

      mOldCube = null;

      mNewCube = null;

      mTempCurrent     = new Static4D(0,0,0,1);

      mTempAccumulated = new Static4D(0,0,0,1);

      mQuatCurrent     = new Static4D(0,0,0,1);

      mQuatAccumulated = new Static4D(0,0,0,1);

      mScreenWidth = mScreenHeight = 0;

      mScrambleCubeNum = 0;

      mFinishRotation        = false;

      mRemoveRotation        = false;

      mFinishDragCurrent     = false;

      mFinishDragAccumulated = false;

      mSolveCube             = false;

      mScrambleCube          = false;

      mCanRotate = true;

      mCanDrag   = true;

      mSizeChangeType    = SizeChangeEffect.Type.TRANSPARENCY;

      mUnscrambleType    = UnscrambleEffect.Type.SPIN;

      mScrambleType      = ScrambleEffect.Type.NONE;

      mSizeChangeDuration= 1000;

      mUnscrambleDuration= 1000;

      mScrambleDuration  = 1000;

      mMesh= new MeshFlat(20,20);

      mNextCubeSize =RubikActivity.getSize();

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

// various things are done here delayed, 'after the next render' as not to be done mid-render and

// cause artifacts.

    @Override

    public void onDrawFrame(GL10 glUnused) 

      {

      mScreen.render( System.currentTimeMillis() );

      if( mFinishDragCurrent )

        {

        mFinishDragCurrent = false;

        mQuatCurrent.set(mTempCurrent);

        }

      if( mFinishDragAccumulated )

        {

        mFinishDragAccumulated = false;

        mQuatAccumulated.set(mTempAccumulated);

        }

      if( mFinishRotation )

        {

        mCanRotate = false;

        mFinishRotation=false;

        mRotationFinishedID = mNewCube.finishRotationNow(this);

        }

      if( mRemoveRotation )

        {

        mRemoveRotation=false;

        mNewCube.removeRotationNow();

        mCanRotate = true;

        }

      if( mNextCubeSize!=0 )

        {

        createCubeNow(mNextCubeSize);

        mCanDrag   = false;

        mCanRotate = false;

        mNextCubeSize = 0;

        sizeChangeEffect();

        }

      if( mSolveCube )

        {

        mSolveCube = false;

        mCanDrag   = false;

        mCanRotate = false;

        unscrambleCubeNow();

        }

      if( mScrambleCube )

        {

        mScrambleCube = false;

        mCanDrag      = false;

        mCanRotate    = false;

        scrambleCubeNow();

        }

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

   @Override

   public void onSurfaceChanged(GL10 glUnused, int width, int height)

      {

      if( mNewCube!=null ) mNewCube.createTexture();

      float cameraDistance = CAMERA_DISTANCE*(width>height ? width:height);

      float fovInDegrees   = computeFOV(cameraDistance,height);

      mScreen.setProjection( fovInDegrees, 0.1f);

      mView.setScreenSize(width,height);

      mView.setCameraDist(cameraDistance);

      mScreen.resize(width, height);

      recomputeScaleFactor(width,height);

      mScreenHeight = height;

      mScreenWidth  = width;

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

   @Override

   public void onSurfaceCreated(GL10 glUnused, EGLConfig config)

      {

      VertexEffectSink.enable();

      SizeChangeEffect.enableEffects();

      ScrambleEffect.enableEffects();

      UnscrambleEffect.enableEffects();

      try

        {

        DistortedLibrary.onCreate(mView.getContext());

        }

      catch(Exception ex)

        {

        android.util.Log.e("Rubik", ex.getMessage() );

        }

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

   public void effectFinished(final long effectID)

     {

     if(      effectID == mRotationFinishedID        )

       {

       mRemoveRotation = true;

       }

     else if( effectID == mSizeChangeEffectID        )

       {

       mCanRotate = true;

       mCanDrag   = true;

       }

     else if( effectID == mUnscrambleEffectID        )

       {

       mCanRotate = true;

       mCanDrag   = true;

       }

     else if( effectID == mScrambleEffectID          )

       {

       mCanRotate = true;

       mCanDrag   = true;

       }

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   private void sizeChangeEffect()

     {

     try

       {

       SizeChangeEffect effect = SizeChangeEffect.create(mSizeChangeType);

       mSizeChangeEffectID = effect.start(mSizeChangeDuration,mScreen,mOldCube,mNewCube,this);

       }

     catch(Exception ex)

       {

       android.util.Log.e("Renderer", "failed to create SizeChangeEffect, exception: "+ex.getMessage());

       if( mOldCube!=null ) mScreen.detach(mOldCube);

       mScreen.attach(mNewCube);

       mCanRotate = true;

       mCanDrag   = true;

       }

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   private float computeFOV(float cameraDistance, int screenHeight)

     {

     double halfFOVInRadians = Math.atan( screenHeight/(2*cameraDistance) );

     return (float)(2*halfFOVInRadians*(180/Math.PI));

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

// no this will not race with onDrawFrame

   void finishRotation()

     {

     mFinishRotation = true;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   void setSizeChangeDuration(int duration)

     {

     mSizeChangeDuration = duration;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   void setUnscrambleDuration(int duration)

     {

     mUnscrambleDuration = duration;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   void setScrambleDuration(int duration)

     {

     mScrambleDuration = duration;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   void setSizeChangeType(SizeChangeEffect.Type type)

     {

     mSizeChangeType = type;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   void setUnscrambleType(UnscrambleEffect.Type type)

     {

     mUnscrambleType = type;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   void setScrambleType(ScrambleEffect.Type type)

     {

     mScrambleType = type;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   boolean createCube(int newSize)

     {

     if( mCanDrag && mCanRotate && (mNewCube==null || newSize != mNewCube.getSize()) )

       {

       mNextCubeSize = newSize;

       return true;

       }

     return false;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   private void createCubeNow(int newSize)

     {

     if( mOldCube!=null ) mOldCube.releaseResources();

     mOldCube = mNewCube;

     DistortedTexture texture = new DistortedTexture(TEXTURE_SIZE,TEXTURE_SIZE);

     DistortedEffects effects = new DistortedEffects();

     mNewCube = new RubikCube(newSize, mQuatCurrent, mQuatAccumulated, texture, mMesh, effects);

     mNewCube.createTexture();

     if( mScreenWidth!=0 )

       {

       recomputeScaleFactor(mScreenWidth,mScreenHeight);

       }

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   private void recomputeScaleFactor(int screenWidth, int screenHeight)

     {

     mCubeSizeInScreenSpace = CUBE_SCREEN_RATIO*(screenWidth>screenHeight ? screenHeight:screenWidth);

     if( mNewCube!=null )

       {

       mNewCube.recomputeScaleFactor(screenWidth, screenHeight, mCubeSizeInScreenSpace);

       }

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   void scrambleCube(int num)

     {

     mScrambleCube = true;

     mScrambleCubeNum = num;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   private void scrambleCubeNow()

     {

     try

       {

       ScrambleEffect effect = ScrambleEffect.create(mScrambleType);

       mScrambleEffectID = effect.start(mScrambleDuration,mNewCube,mScrambleCubeNum,this);

       }

     catch(Exception ex)

       {

       android.util.Log.e("Renderer", "failed to create ScrambleEffect, exception: "+ex.getMessage());

       mCanRotate = true;

       mCanDrag   = true;

       }

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   void unscrambleCube()

     {

     mSolveCube = true;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   private void unscrambleCubeNow()

     {

     try

       {

       UnscrambleEffect effect = UnscrambleEffect.create(mUnscrambleType);

       mUnscrambleEffectID = effect.start(mUnscrambleDuration,mScreen,mNewCube,this);

       }

     catch(Exception ex)

       {

       android.util.Log.e("Renderer", "failed to create UnscrambleEffect, exception: "+ex.getMessage());

       mNewCube.unscramble();    //

       mCanRotate = true;        // just unscramble the cube

       mCanDrag   = true;        //

       }

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   float returnCubeSizeInScreenSpace()

     {

     return mCubeSizeInScreenSpace;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   boolean canRotate()

     {

     return mCanRotate;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   boolean canDrag()

     {

     return mCanDrag;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   RubikCube getCube()

     {

     return mNewCube;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   void setQuatCurrent(Static4D current)

     {

     mTempCurrent.set(current);

     mFinishDragCurrent = true;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   void setQuatAccumulated(Static4D accumulated)

     {

     mTempAccumulated.set(accumulated);

     mFinishDragAccumulated = true;

     }

}